Background and Aim: Dynamic balance is a key element in everyday and sports activities and it is important to examine the factors that affect it. The present study focused on the relationship between arousal and activation with dynamic balance at different times of the day. Materials and Methods: A total of 30 male participants, aged 21.01±1.64 performed dynamic test at 10:00 a.m., 15:00, and 20:00 p.m. on a single day. Skin conductance level of participants was recorded continuously during performing balance task. ANOVA, Pearson correlation, and regression were used to analyze the data. Results: The results indicated that dynamic balance based on reaching distance was higher at 15:00 p.m. than 20:00 p.m. and 10:00 a.m. It was also found that a linear relationship exists between activation and performance; the intensity of correlation was higher in the afternoon. Conclusion: These findings support the idea on separation of arousal and activation as separable aspects of the physiological and behavioral functions. In this approach, the activation was introduced for the afternoon as the factor causing superiority of dynamic balance, as compared with morning and evening.

Reilly T, Fairhurst E, Edwards B, Waterhouse J, editors. Time of day and performance tests in male football players. Science and Football V: The Proceedings of the Fifth World Congress on Sports Science and Football; 2005: Routledge. ##